IsBlank — Power Fx function reference

Syntax

IsBlank( Value )

Examples

IsBlank(txtName.Text)

If(IsBlank(cmbAssignee.Selected), Notify("Pick an assignee", NotificationType.Error), SubmitForm(frmTask))

IsBlank(LookUp(Staff, Email = User().Email))

Common mistakes & gotchas

• A zero-length string is not blank. Use IsBlank(Trim(x)) or x = "" for empty input.
• An empty text string ("") is not blank — IsBlank("") is false. Check IsBlank(Trim(txtInput.Text)) or compare with = "" to also catch whitespace-only input.
• IsBlank is true both for a genuinely null field and for a LookUp that found nothing, so you cannot tell "no data" apart from "not found" from the result alone.

Related Power Fx functions

From Conditional logic

Used in these tutorials